package com.xyh.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.xyh.eduservice.entity.EduSubject;
import com.xyh.eduservice.entity.excel.SubjectData;
import com.xyh.eduservice.service.EduSubjectService;
import com.xyh.servicebase.exceptionHandler.GuliException;
import org.springframework.stereotype.Component;

import java.util.Map;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    //因为 SubjectExcelListener 不能交给 spring 进行管理，需要自己 new ，不能注入其他对象
    //不能使用数据库操作
    public EduSubjectService subjectService;

    public SubjectExcelListener() {

    }
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //一行一行读取excel内容
    @Override
    public void invoke(SubjectData data, AnalysisContext analysisContext) {
        if (data == null) {
            throw new GuliException(20001,"文件数据为空");
        }
        //一行一行读取，每次读取有两个值，第一个值为一级分类，第二个值为二级分类
        EduSubject existOneSubject = this.existOneSubject(subjectService, data.getOneSubjectName());
        if (existOneSubject == null) {  //没有一级分类，，进行添加
            existOneSubject = new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(data.getOneSubjectName());   //设置一级分类名称
            subjectService.save(existOneSubject);
        }

        //获取一级分类的 id 值
        String pid =existOneSubject.getId();
        //添加二级分类
        //判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(subjectService, data.getTwoSubjectName(), pid);
        if (existTwoSubject == null) {  //没有二级分类，，进行添加
            existTwoSubject = new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(data.getTwoSubjectName());   //设置二级分类名称
            subjectService.save(existTwoSubject);
        }
    }
    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService,String name){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }
    //读取表头内容
    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
        System.out.println("表头："+headMap);
    }
    //读取完成之后
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) { }
}
